What Growing Zone Is Ironton?

Our records indicate the United States Department of Agriculture has given Ironton a growing zone designation of 6a. Sometimes also called the planting or hardiness zone, this zone number gives you an idea of what plants can and cannot grow in Ironton's climate based on the average extreme annual temperature.Our data is based on the latest 2023 USDA maps, which used Ironton's weather data from 1991 - 2020 in their analysis.

Latest MI growing zone map

If you are looking for plants suitable for growing in the Ironton area, head on over to our page on plants that grow well in Ironton, MI.

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Decorative arbor trellis for climbing plants and garden entrance.

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Compact greenhouse perfect for small spaces.

Latest MI growing zone map

The growing zone is a measure of the lowest temperature that a plant can survive based on average lowest year temperatures, helping you to decide what plants would grow best in your particular climate. Since Ironton is in growing zone 6a this means that plants there can survive temperatures as low as -10 to -5 degrees Fahrenheit. Plants for Ironton's climate should be chosen with this in mind, or plants should be moved inside to keep their core temperature in the right range if necessary.

USDA growing zone map of the United States

Some zones may have been changed by the USDA as of 2023. To see if the Ironton area has been affected, refer to this map of half zone changes from the 2012 version of the USDA zones to the 2023 version.

map of usda hardiness zone changes from 2012 to 2023

Half zone changes from 2012 to 2023

The updated map shows that over half of the Southeast has warmed by about half a zone. For gardeners, that means you can now grow plants that tolerate a bit more heat and less frost than before. The tan areas reflect this shift. Meanwhile, the white areas had slight temperature changes, but not enough to move them into a new zone. In the Western U.S., a few spots shifted cooler. That’s not due to a colder climate, but because the new map uses a larger dataset, giving a more accurate picture of local conditions. It's important to keep track of these changes when planning your garden!

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Hardiness Zone FAQ

Have questions about hardiness zones and what they mean for your garden? Check out our FAQ below for quick answers to common questions about USDA hardiness zones and how they affect plant selection in Ironton, MI.

The USDA hardiness zone is 6a for Ironton. This is sometimes also referred to as the growing or planting zone. These terms are used interchangeably.

Ironton's Growing Zone Details

USDA Growing Zone: 6a

Zip Codes: 49720

Longitude: -85.1929

Latitude: 45.257

Lowest Avg Temperatures (F): -10 to -5

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Map of the Ironton Area

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Fiskars Garden Harvest Basket

Sturdy basket for collecting and carrying your garden harvest.

Wooden Chicken Coop

Spacious and secure home for your backyard chickens.

Metal Seed Storage Box

Organized storage solution for your seed collection.

Brass Decorative Faucet Handle

Elegant brass handle to enhance your garden faucet.

Brass Watering Can

Elegant brass watering can with classic design and durability.

Plants For Other States

Looking for the best plants in a different area of the United States? Click on a button below to find plants that are ideal for that state's temperatures.

Self Watering Plant Pots

Innovative pots that maintain optimal moisture levels.

Small Greenhouse Kit

Compact greenhouse perfect for small spaces.

Large Greenhouse Kit

Spacious greenhouse for extending your growing season.

Seed Starting Trays

Perfect for starting seeds indoors before transplanting to your garden.

Metal Seed Storage Box

Organized storage solution for your seed collection.

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